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https://issues.apache.org/jira/browse/CASSANDRA-358?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12742407#action_12742407
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Jonathan Ellis commented on CASSANDRA-358:
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I think I understand: because you're returning a new SMD if the token is 
already created, but you want it to be "equal to" the other ones.

This looks like it can cause subtle bugs -- generation is supposed to be 
"global" to the node.  I think caching the SMD rather than the token would be 
cleaner and less error-prone.

> SystemTable.initMetadata throws an NPE when called twice
> --------------------------------------------------------
>
>                 Key: CASSANDRA-358
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-358
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Jeff Hodges
>         Attachments: 358-5.patch, 358-7.patch
>
>
> While this is not the expected use case of it, SystemTable.initMetadata 
> throws an NPE when called twice in the same process.  The error points to 
> tokenColumn being null even through cf is not at line 111.

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